Industrial Technology Research Institute

Cheng-Min Chang

Chun-Chieh Chang

Chia-Min Ting

Po-Huan Chou

Hsi-Chih Chang

Hsin-Hung Chou

Yu-Hsun Wu

Kuo-Lin Chiu

Wen-Che Shen

Ya-Ling Chang

Se-Kang Ho

Chiu-Pao Tien

Chen-Chih Lin

Hsien-Chang Huang

Jia-Yao Jhang

A clamping circuit includes an insulated-gate bipolar transistor (IGBT), a transient-voltage-suppression (TVS) diode module, an isolated driving unit, a first independent power source and a first current limiting resistor. A second terminal of the TVS diode module is connected to a collector of the IGBT. A primary side of the isolated driving unit is connected to a first terminal of the TVS diode module, and a first terminal of a secondary side of the isolated driving unit is configured to receive a power voltage. The first independent power source is configured to provide the power voltage to the first terminal of the secondary side of the isolated driving unit. A terminal of the first current limiting resistor is connected to a second terminal of the secondary side of the isolated driving unit, and the other terminal of the first current limiting resistor is connected to a gate of the IGBT.

Clamping circuit

A voltage measurement device for pulse-width modulation (PWM) signals is provided, which includes a conversion circuit and a processing circuit. The conversion circuit receives a first PWM signal and a second PWM signal from a motor driving device, and converts the first PWM signal and the second PWM signal into the absolute value signal and the polarity signal of the line-to-line voltage signal between the first PWM signal and the second PWM signal. The processing circuit converts the polarity signal and the absolute value signal into a first integral signal and a second integral signal, and reconstructs the line-to-line voltage signal according to the first integral signal and the second integral signal so as to obtain the reconstructed voltage signal of the line-to-line voltage signal.

Voltage measurement device for pulse-width modulation signals, motor driving device and method thereof

A motor drive is provided, which includes a control circuit, a first transistor, a first comparison circuit, a second transistor and a load. The control circuit includes a first output terminal and a second output terminal; the first output terminal outputs a first control signal; the second output terminal outputs a second control signal whose phase is inverse to the phase of the first control signal. The gate of the first transistor receives the first control signal. The first comparison circuit compares the gate-source voltage with a reference voltage to generate a first comparison signal. When the first comparison signal shows that the first control signal is reduced to be lower than the reference voltage, the second control signal generated by the second output terminal is transmitted to the gate of the second transistor.

Motor drive and method for reducing dead band of motor drive

The disclosure provides a stator module and a magnetic field generating structure which includes a magnetizer and an electrically conducting pipe. The electrically conducting pipe is wound around the magnetizer and has a passage inside. The passage has an outlet and an inlet opposite to each other. The electrically conducting pipe has a current input portion and a current output portion.

Stator module and magnetic field generating structure thereof

A low speed control method and an apparatus for a servo motor. The control apparatus comprises: an encoder capable of acquiring a speed signal from a servo motor and encoding the speed signal to output a low-resolution encoded signal; an insertion calculation unit capable of receiving the low-resolution encoded signal from the encoder to be processed by an interpolation operation for converting the low-resolution encoded signal into a high-resolution encoded signal to be outputted therefrom; a servo control chip capable of setting internal parameters and receiving the high-resolution encoded signal from the insertion calculation unit to be processed by a calculation process so as to output a switch control instruction; and a power module capable of receiving the switch control instruction from the servo control chip and then transmitting the same to the servo motor for adjusting the operation speed of the servo motor.

Low speed control method and apparatus for servo motor

Growing community of inventors

Keelung, Taiwan

Cheng-Min Chang